/**
 * Software License, Version 1.0
 * 
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 *
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 *modification, are permitted provided that the following conditions are met:
 *
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 * notice, this list of conditions and the disclaimer listed in this license in
 * the documentation and/or other materials provided with the distribution;
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 * following acknowledgment:
 *
 *"This product includes software developed by the Community Grids Lab. For 
 * further information contact the Community Grids Lab at 
 * http://communitygrids.iu.edu/."
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 * wherever such third-party acknowledgments normally appear.
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 *4) The name Indiana University or Community Grids Lab or Granules, 
 * shall not be used to endorse or promote products derived from this software 
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package cgl.granules.samples.periodic;

import java.util.Properties;

import cgl.granules.operation.MapReduceBase;

/**
 * An example demonstrating support for periodicity. This particular operation
 * will be scheduled for execution at the specified periodic interval.
 * 
 * @author Shrideep Pallickara
 * 
 */
public class PeriodicMap extends MapReduceBase {

	private int iteration = 0;
	private int terminateAtIteration = 20;
	private String workerType = null;
	private long toggleInterval = 1000;
	private long[] delays = new long[terminateAtIteration];
	private long lastExecutionTime = 0;
	private boolean debug = true;

	public PeriodicMap() {
		setDomain("Generic");
		setVersionInformation(200);
		setOperationIdentifier("WCPeriodic-MapFunction-GranulesSample");
		lastExecutionTime = System.currentTimeMillis();
	}

	public void execute() {
		delays[iteration] = System.currentTimeMillis() - lastExecutionTime;
		iteration++;
		if (workerType == null) {
			String property = "Worker Number";
			Properties props = getProcessingDirectives();
			if (props.containsKey(property)) {
				workerType = props.getProperty(property);
			} else {
				workerType = "[Unknown]";
			}
		}

		performSomeFunction();

		if (iteration > 0) {
			if (iteration == terminateAtIteration) {
				String report = workerType + " ";
				for (int i = 0; i < terminateAtIteration; i++) {
					report += (delays[i] + " ");
				}

				System.out.println(report);
				setTeminationConditionReached();
			}
			return;
		}
	}

	/** Performs a very simple operation. */
	private void performSomeFunction() {
		if (debug) {
			System.out.println("PeriodicMap: " + workerType + ",   Iteration ("
					+ iteration + ")");
			changePeriodicity();
		}
	}

	/** Change the periodicity associated with the operation at runtime. */
	private void changePeriodicity() {
		if (iteration == 15) {
			toggleInterval = 4000;
			changeToExecutePeriodically(toggleInterval);
		}
	}

}
